fix doxygen brief in subzero header files

src/IceConditionCodesARM32.h

 //===- subzero/src/IceConditionCodesARM32.h - Condition Codes ---*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
-/// This file declares the condition codes for ARM32.
+/// \brief Declares the condition codes for ARM32.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICECONDITIONCODESARM32_H
 #define SUBZERO_SRC_ICECONDITIONCODESARM32_H
 
 #include "IceDefs.h"
 #include "IceInstARM32.def"
 
 namespace Ice {
 
 class CondARM32 {
   CondARM32() = delete;
   CondARM32(const CondARM32 &) = delete;
   CondARM32 &operator=(const CondARM32 &) = delete;
 
 public:
   /// An enum of codes used for conditional instructions. The enum value should
   /// match the value used to encode operands in binary instructions.
   enum Cond {
 #define X(tag, encode, opp, emit) tag = encode,
     ICEINSTARM32COND_TABLE
 #undef X
   };
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECONDITIONCODESARM32_H